A Class of Data-Aided Timing-Recovery Schemes

This paper develops a class of data-aided timing-recovery schemes whose structure and operating principle are reminiscent of zero-forcing equalizer adaptation. The schemes exhibit no pattern-dependent jitter and are applicable to a variety of modulation codes and reception techniques. They come in both oversampled and baud-rate forms, and permit maximum-likelihood tracking performance whenever the oversampling factor satisfies the sampling theorem. Subject to this condition, even simple schemes can be close to optimum. It is shown that various existing schemes belong to the class under study or are closely related to it.